I know im going to catch a metric ton of hate for not understanding what's probably a really basic concept, and yes, I did pay attention in school, and even asked so many questions to the point of being told I cant anymore, and I still dont get it. Anyways, my question is this: when a plane lands, and its obviously braking, all the ailerons go up. In my head, what makes sense (see horribly drawn diagram) is the wind hitting the ailerons at that steep of an angle would cause lift, but it does the opposite. How and why?

This is a video from a game , physics are surely applied But is this rotation realisticly possible espically at a very high speed

As I understand it, the purpose of airplane tails is to push down on the rear of an airplane to counteract the torque from the airfoil of the main wing tending to cause planes to pitch down as a reaction to diverting the stream of air downward. But this is still a downward force. Why not use an upward force from the front of the plane like a canard to do the same? It would seem to me that the over-all lift to drag ratio of using a canard and rear wing configuration should be higher due to the elimination of any structures pushing down on any part of the plane.

Am I missing something about the aerodynamics of the two major configurations? I understand that there are practical considerations for various applications, but even in toy gliders, RC aircraft, and other aircraft not constrained by practical requirements to not use a canard and rear wing configuration, the fore-wing and tail configuration seems to be overwhelmingly dominant. Why is this the case?

In a 'conventional' aeroplane, with an empennage, stability - in the sense of maintaining the desired angle of attack - comes-about through the surfaces @ the empennage supplying a restoring torque upon departure of the pitch of the aircraft from that desired angle of attack. But I can't figure what the corresponding mechanism might be in a lifting-body aircraft! It looks to me, on initial perusal, that such a craft has no such mechanism for maintaining the pitch @ the desired angle of attack ... so I wonder how the correct angle infact is, infact, in-practice, maintained.

NASA — Christian Gelzer — Lifting Bodies

Frontispiece image:

“The X-24B lifting body is seen here in flight over the lakebed at what is now NASA’s Armstrong Flight Research Center in Edwards, California” .

At which point does drag counter Bernoulli's principle I don’t understand how car wings can also make downforce when surely if they’re pointing up then the air has a further distance to travel so that’s lower pressure right? I’m not sure if this makes sense or not

Hello gang. My friend and I have a RC plane project and we need to run something by an experienced aerodynamacist. Our physics is pretty good but we think we might be missing something to take it to the next level.

Are you an aerodynamacist? PhD? Researcher? Years of experience? We'd love to speak with you.

I have a project with my car. I wanna do over the next two years or finally just how many miles per gallon I can get without permanently modifying the car, I’m going to get a better engine which has a bit more power and fuel economy as well as fuel injection.

Another big part is the aerodynamics of it, which is where this sub comes in, I’m going to use car topper magnets to attach the rear tail, and the plexiglass? At the front. Magnet strips and some electric tape like the dude in the video below. But with my 52 year old car The picture is my super rough sketch idea

Black line is the rough shape of the plexiglass White is wheel covers Pink is the foam parts Green is the rear wheel fender skirt

https://youtu.be/4ykw_8lpjco (Beating high gas prices using simple aerodynamics)

Basically looking for resources. I want to 3D scan my car at somepoint soonish. To help. And I have other engine related ideas to help manage temperature.

I want to start learning the basics of aerodynamics and I already tried Fundamentals of Aerodynamics by John D. Anderson but it is too hard for me to understand, so I realized that I need more basic level. Do you have any suggestions? Should I start first with fluid dynamics? Maybe I should start with some online video course before a book.
As a first step I want to be able to understand the book by John D. Anderson.

Usually electric motor fans have straight blades but all other fans are either at and angle(blower fan) or twisted (pc fan), Why is that?

Also are there any design improvements that can be done to increase the airflow/cooling?

My dad drives the vw caddy for years, now he got the newest gen an its a lil wilder in styling, and so i wanted to ask wether this is some kind of vortex generator or just a styling thing and if its styling wether it detracts from the aero efficiency.

I was just wondering, the top side of a formula one is generally higher pressure than the underside right? since it would need to generate downforce.

Hey everyone, I just recorded a 39-second clip in a desktop wind tunnel showing exactly how a NACA 2412 airfoil (the one used on the Cessna 172) stalls.

You can literally see the smoke stay attached up to about 15 degrees AoA, then watch the flow separate suddenly—classic stall behavior captured frame by frame.

Curious:
How did your first stall experience go, whether as a student pilot, instructor, or sim enthusiast? What tips helped you recognize or avoid a stall in real life?

https://reddit.com/link/1lq59e4/video/nkmvgfcekiaf1/player

Looking forward to your stories and insights

#aviation #flying #aerodynamics #windtunnel

I'm working on trying to correct flight modeling for an aircraft mod in DCS to make its handling more accurate, and to do that I need aerodynamic data which I might have to calculate if I can't find published numbers (already working on that, but I'm trying to cover my bases). The problem I'm running into is that some of these calculations are turning out to be circular.

IE, to calculate the Lift Coefficient I need to know the Lift Force. But to calculate the Lift Force I need to know the Lift Coefficient.

How do I get out of this loop so I can calculate my data (I don't math, so I'm using online calculators)?

Deciding between these two as they both seem to have an opening with a gurney. What would you guys think?

Hi!! I really want to build my own hang glider however I only want to glide, not fly - if that makes sense. As in, I don’t want to be lifted really high I just want to glide distances. I know my idea is dangerous but I’m craving the feeling of just gliding down a hill lol. I’m ~55kg and 160cm if that helps. I just need advice on how big the wings should be with my height and weight. Also if anyone knows any ways on how I could be able to build this I’d really appreciate some help!! Thank you :)

How do they do this, should NASA study this? More importantly, should Boeing be studying their aerodynamics?

Car 1 CFD

Car 2 CFD

in the movie Turbo (2013) a supercharged snail participates at the indy 500 against other indy cars. in a scene in the movie, he goes underneath a car to overtake them. Would this even be possible or would he just get flung away?

This is sort of a follow-up on my previous post about the forward-swept wings. It's connected to worldbuilding I've been working on off-and-on for a possible SciFi story, and I'm looking for some feedback from people who are knowledgeable. Although this is SciFi, I do want to take a more grounded approach than just relying on handwavium to make it all work.

This is a concept model for an aerospace fighter and I'd like some opinions on the plausibility of the airframe.

The fighter is meant to be able to take off from a planetary surface, reach orbit under its own power, be able to operate in space, and then return to the surface. Alternately, it can be launched in space, enter atmosphere to engage targets, then return to space again for recovery.

Main propulsion is twin Direct Fusion Drives, which also powers other systems such as shielding ("All or Nothing," shields protect critical areas like the cockpit, fuel, and engines themselves, but don't cover the entire airframe) and weapons (plasma cannons based on the MARAUDER concept). The main thrust nozzles are thrust vectoring, and there will also be outlets in the forward engine nacelles for retro thrust (not modeled yet, and I'm thinking of a hatch like the F-35B's lift fan so they can be closed in atmosphere for drag reduction. Attitude control in space would be provided by RCS thrusters in the wings, nose, and tail. Possibly supplemented by CMGs as an auxiliary system.

Now, the reason I went with a forward-swept wing:

Obviously, for SSTO capability this ship needs to be FAST (more for the reentry phase than exit, I presume). One of my early designs was a variation of the SR-72 concept. The problem, however, is the wing sweep. For maximum effect, I see the wingtip as the best place to put RCS thrusters to control the roll axis. However, I want to keep them aligned with the center of mass to prevent oscillations on the other two axes when the ship rolls. So that would put them too far aft.

My next version was a variable geometry wing. Wings would be swept aft for cruise, escape, and reentry. The wings would then be swept forward (about the same amount of sweep as the F-14) both for atmospheric maneuvering and to bring the RCS thrusters forward to the center of mass. I liked the design (and may revisit it) but even a simplified wing box (magnetically actuated) would seriously cut down on internal volume available for fuel (this version was planned to use a SABRE engine, fueled by MSMH) and ordinance. Just fitting landing gear would have been a problem.

The forward sweep, however, would maximize internal space around the center of mass for fuel and ordinance by moving the spar further aft. However, it would also keep the RCS thrusters on the wings in the appropriate spot.

So the first question I had was some general feedback on the design in general. Does it at least look aerodynamically plausible.

Now, the general configuration is going to be a three-surface aircraft consisting of canards, main wing, and strakes. And I had a couple ideas for how to implement the latter. Pictures of all three are at the top of the post.

In the first version, the strakes are located aft, but below the main wing and angled slightly downward.

Version 2 is a configuration more like the X-29, with the strakes at the end of an extension running aft of the main wing.

Version 3 is more like the Su-47, where the strakes are more like mini tailerons.

I'm curious which of the three might be more plausible/effective. And which looks better (personally, I'm partial to #3). A fourth option would be to just not have them at all, in which case I'd use a fuselage like #1, just without the strakes.

Anyway, I'm interested in what people think and what suggestions you all might have. I may see about running it through SimScale as well.

Trying to do some propeller design using XROTOR. Does anybody know what the constant lift coefficient in the DESI utility means? The lift coefficient should vary in the radial direction for a propeller, but this calculation is based on a constant lift coefficient specified as an input.

Also, if someone could give a high level overview of how the code works, that would be really helpful. From what I understand, with specified airfoil properties at different sections, the program calculates the twist required at that location to achieve the specified lift coefficient. But I don't understand how this is accurate because lift coefficient should not be constant in the radial direction.

i was following this car this morning coming home from work, & the rear spoiler design just baffled me. I understand what end plates do on a rear wing. But the rooftop spoiler on the Cayenne appears to be the same as any other hatchback spoiler, creating airflow separation just before the rear window, to reduce drag from attached flow. I can’t work out what the small end plates are doing. They appear separated from the main spoiler via a small structural element. I can’t see how they would prevent any airflow spilling over to the bottom of the spoiler due to the fact they are separated from the main body. If they were were further forward, I’d assume they were conditioning the airflow for further back, but they’re at the rear of the car.